Positive opk supposedly on 7dpo

Coco • Im coco im 32 TTC with my fiance my 2 babies were both 24 weeks which ended in stillborn waiting on my 🌈 👶🏽👶🏽
I take an opk I get ewcm then negative the next day then another positive this has been happening since cd 9 I'm on about cd 18now and today I got a strong positive everywhere there is a plus on the calendar is when the opk was positive.